IEC 62056-21 decoder to ModBus

ELM-07S is specially designed to allow easy accommodation of electricity meters to the global remote reading system. IEC 62056-21 (formerly 61107) is a serial protocol for transmitting data, designed specially for electricity meters.

Since it is ASCII-based, information in the basic case is too heavy to be read and takes a lot of time (and costs). Here comes the ELM-07S converter. The converter acts as a master that reads regularly all connected electricity meters through the RS-485 interface. Read information is saved in the Modbus register map. For each meter, there is available memory space, where information from up to 63 registers from IEC 62056-21 can be transferred to Modbus. Modbus is both RTU and TCP, which means that one can use ELM-07S as a direct remote gateway to read electricity meters.

Normally RS-485 drivers in most electricity meters allow up to 32 devices in the network, that is why our ELM-07S is designed exactly for 32 slaves. Nevertheless, ELM-07S comes with an RS-485 driver for 250 devices, so if electricity meters allow it, we can increase the number of supported electricity meters in one network.

The device comes in an aluminium enclosure and is mounted on a standard DIN rail, usually in industrial enclosures. Modbus RTU is on terminal blocks, Modbus TCP is on a standard RJ-45 plug.

User Manual

Technical characteristics of IEC 62056-21 decoder to ModBus

max. number of IEC62056-21 devices	32
converted registers/values	up to 63
power supply	165-235 VAC (210-270 VDC)
power consumption	< 5 W
IEC interface bps	300/1200/2400/4800/9600/19200/38400/115200 bps, 7 data bits, Even
Modbus RTU bps	300/1200/2400/4800/9600/19200/38400/115200 bps, 8 data bits, None
work temperature	from -20° C to +50° C
storage temperature	from -50° C to +90° C
humidity	40 ÷ 90 %
dimensions (HxWxD), mm	105/107/74 mm
protection class	IP20
display	3 LEDs (on, IEC activity, Modbus activity)
own weight	475 g
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